X1

Certainly! X1 generally refers to a primary variable or feature in a dataset or model, representing a specific measurement or characteristic. For example, if you're analyzing housing data, X1 might be the size of the house in square feet. In statistical or machine learning contexts, X1 is often used as the first input factor that helps predict or explain an outcome. Its value can influence the results, making it an important component in understanding relationships within the data.